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ipnat - ?ͥåȥ?????ɥ쥹?Ѵ? (NAT) ?Υ????ͥ륤?󥿥ե?????

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#include <netinet/ip_compat.h>
#include <netinet/ip_fil.h>
#include <netinet/ip_proxy.h>
#include <netinet/ip_nat.h>

IOCTL

NAT ?ꥹ?Ȥ˥롼?????ɲä????Ӻ??????뤿???ˡ? 2 ?Ĥ? `????Ū' ?? ioctl ???󶡤????Ƥ??ޤ??? ioctl ?ϲ????Τ褦?˸ƤФ??ޤ?:

	ioctl(fd, SIOCADNAT, struct ipnat *)
	ioctl(fd, SIOCRMNAT, struct ipnat *)

ipf(4) ?Ȥϰۤʤꡢ?????ͥ??? NAT ???󥿥ե??????ˤ??ä? ???ݡ??Ȥ????Ƥ????ꥹ?Ȥ? 1 ?Ĥ????Ǥ??? ư?????Υꥹ?Ȥȸ򴹲?ǽ????ư?????Υꥹ?Ȥε?ǽ?ϡ? ???ߤϥ??ݡ??Ȥ????Ƥ??ޤ?????

?嵭?? ioctl ?ϡ??롼?ƥ????? ioctl ?Ȥ??ƿ??񤦤褦?? ?????????Ƥ????Τǡ??Ƽ??Υ롼?ƥ????? ioctl ???Ѥ??????Τ? Ʊ???롼?????ե????뵭?һҤ????Ѥ????ޤ??? ?????Ƥ??ξ??? fd ?ϡ????Υ⥸?塼???˴?Ϣ???? ?ǥХ??? (?㤨?? /dev/ipl) ?Υե????뵭?һҤǤ??뤳?Ȥ?ɬ?פǤ???

NAT ???󥿥ե????????Ѥ??????빽¤?Τϰʲ????̤??Ǥ?:

typedef struct  ipnat   {


        struct  ipnat   *in_next;


        void    *in_ifp;


        u_short in_flags;


        u_short in_pnext;


        u_short in_port[2];


        struct  in_addr in_in[2];


        struct  in_addr in_out[2];


        struct  in_addr in_nextip;


        int     in_space;


        int     in_redir; /* 0 ?ޥåפ????Ƥ??롢1 ???????쥯?ȤϺ??? */


        char    in_ifname[IFNAMSIZ];
} ipnat_t;
#define in_pmin         in_port[0]    /* ??Ū?ʥ??????쥯?ȥݡ??Ȥ??ݻ? */
#define in_pmax         in_port[1]
#define in_nip          in_nextip.s_addr
#define in_inip         in_in[0].s_addr
#define in_inmsk        in_in[1].s_addr
#define in_outip        in_out[0].s_addr
#define in_outmsk       in_out[1].s_addr

in_redir ??ǧ??????????:

#define NAT_MAP         0
#define NAT_REDIRECT    1

NAT ????

?ޥåפ??줿?ѥ??åȤο????????????줿?ѥ??åȤο? ?˴ؤ??????פ??μ褵???ޤ??? ?ޤ???NAT ?ơ??֥??˿????Υ????ȥ꤬?ɲä??줿?ꡢ (?????ڤ??Τ?????) ?????ȥ꤬???????줿?????丽?ߤ? NAT ?ơ??֥??? ?????̤˴ؤ??????פ??μ褵???ޤ???

?????ͥ??????ˤ??? NAT ?ơ??֥??ؤΥݥ??󥿤ȡ? SIOCADNAT ioctl ???Ȥ?Ω?Ƥ??줿?????? NAT ?ꥹ?Ȥ? ??Ƭ?ؤΥݥ??󥿤????????ޤ???

???Υơ??֥뼫?Ȥϡ?NAT_SIZE (?ǥե????ȤǤ? 367) ???礭???? ?ϥå????ơ??֥??Ǥ???

???פ??????????ˤϡ?SIOCGNATS ioctl ???Ѥ??ơ? Ŭ?ڤʹ?¤?Τ??ʲ??Τ褦?˻??Ȥ??Ϥ?ɬ?פ??????ޤ?:

	ioctl(fd, SIOCGNATS, struct natstat *)
typedef struct  natstat {


        u_long  ns_mapped[2];


        u_long  ns_added;


        u_long  ns_expire;


        u_long  ns_inuse;


        nat_t   ***ns_table;


        ipnat_t *ns_list;
} natstat_t;

?Х?

?ե??륿?롼?????ɲä??????????äȽ????ˤǤ??????ɤ??Ǥ??礦??

??Ϣ?ե?????

/dev/ipnat

??Ϣ????

ipf(4), ipnat(5), ipf(8), ipnat(8), ipfstat(8)